#include    <sys/types.h>
#include    <machine/ioctl_bt848.h>
#include    <sys/fcntl.h>
#include    <sys/ioctl.h>

#include    <stdio.h>
#include    <stdlib.h>
#include    <unistd.h>
#include    <string.h>
#include    <sysexits.h>
#include    <err.h>

#define DEF_BKTRDEV "/dev/tuner0"

static void
_usage(void)
{
    fprintf(stderr, "Usage: %s [-f <device>] <chan>\n", getprogname());
    exit(EX_USAGE);
}

int
main(int ac, char *av[])
{
    int		ch;
    const char	*devfn = DEF_BKTRDEV;
    u_int	chan;
    char	*ae;
    int		dfd;

    while ((ch = getopt(ac, av, "f:")) != -1)
	switch (ch)
	{
	    case 'f':
		devfn = optarg;
		break;
	}
    ac-= optind;
    av+= optind;
    if (ac != 1)
	_usage();
    chan = strtoul(av[0], &ae, 10);
    if ((size_t)(ae - av[0]) < strlen(av[0]))
	_usage();
    if ((dfd = open(devfn, O_RDWR)) == -1)
	err(EX_OSFILE, "cannot open tuner device %s", devfn);
    if (ioctl(dfd, TVTUNER_SETCHNL, &chan) == -1)
	warn("error setting channel");
    close(dfd);
    return EX_OK;
}